Title:
CHARGE PUMP FOR A LOW-VOLTAGE WIDE-TUNING RANGE PHASE-LOCKED LOOP
Document Type and Number:
WIPO Patent Application WO2005099094
Kind Code:
A3
Abstract:
A charge pump for a differential phase-locked loop (PLL) is provided. The charge pump includes a current switch configured to voltage to source and sink a current in a complementary fashion from a pair of differential output nodes. The charge pump includes a common-mode feedback loop to maintain the charging and discharging of the differential output nodes with respect to a common-mode voltage. Transconductance amplifiers are provided within the common-mode feedback loop to provide greater dynamic range to the charging and discharging of the differential output nodes.
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Inventors:
ZHU XIANG (US)
QU MING (US)
GE YONGMIN (US)
QU MING (US)
GE YONGMIN (US)
Application Number:
PCT/US2005/010949
Publication Date:
March 23, 2006
Filing Date:
March 31, 2005
Export Citation:
Assignee:
LATTICE SEMICONDUCTOR CORP (US)
International Classes:
H03L7/00; H03L7/089; H03L7/18; (IPC1-7): H03L7/00
Foreign References:
| US6686794B1 | 2004-02-03 | |||
| US6292061B1 | 2001-09-18 | |||
| US20050024112A1 | 2005-02-03 |
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